Seiko Caliber 7B62
Seiko Caliber 7B62

Seiko Caliber 7B62

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ManufacturerSeiko
Caliber Number7B62
Movement TypeSolar-powered, radio-controlled, quartz
Display
Analog
Jewel Count
0
Frequency
32,768 Hz
Capacitor Part #
3023 24M, 302324M (unconfirmed!)
Power Reserve
~9 months on a full charge
Integrated Circuit
2 piece IC – Oscillator, frequency divider, drive/reception circuit
Driving System
Step motor
Hand Count3
FunctionsCentral hours; central minutes; central seconds; date at 3:00
Other Features
Radio signal reception for automatic time setting
Hacking Seconds?
Yes
Country of ManufactureMade in Japan
Known Models
Seiko Selection Solar Radio (Ref: SBTM335) (Add your watch to the comments below…)

Seiko caliber 7B62 is a radio-controlled quartz movement that runs on a rechargeable battery (aka capacitor) connected to a solar sensor under the dial which collects and stores energy from light. Timepieces with this movement were introduced in 2019~2020 for the Japan domestic market (JDM).

Radio-Controlled Timekeeping:

The radio-controlled features means that watches with this calibre are able to connect to radio towers (Cesium Atomic Clock) in order to receive data about the current time. The watch then uses that information to automatically set the time accordingly.

In Seiko’s own words:

“This watch sets the time and date by automatically receiving a radio signal at a fixed time. It automatically receives a radio signal before 2:00 AM, 3:00 AM and 4:00 AM.” -Seiko 7B72 user manual, page 17

Similar Calibers:

There is a similar caliber 7B72. The 7B62 and 7B72 share the same manual, however, it is unclear what the differences are. If you know more about this, please discuss it in the comments below…

Additional Resources:

Seagull Caliber St19

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